Camera



Jan. 25, 1944.

w. H. RICHARDS CAMERA Filed Nov'. 22, 193s 8 `Sheets-.Sheet l ffl Jan.25, 1944. w. H. RICHARDS 2,339,310

CAMERA F'iled Nov. 22, 1939 8 SheebS-Sheet 2 8 Sheets-Sheet 3 /ZzL/4f/L/,4/V /7f Q CAMERA- Filed Nov. 22, 1959 w. H. RICHARDS Jan. 25,1944.

Jan.. 25, 1944.

w. H. RICHARDS 'CAMERA Filed Nov. 22, 1939 8 Sheets-Sheetrl Jan .*25,41944. w, HgRlcHARDs 2,3395810 GAMERA Filed Nov. ,22, 1939 SSheets-Sheet 5n 25, 1944. 1 W.H RlcHARDs l I K 2,339,810

CAMERA Filed Nov. 22. 19,39 8 Sheets-Sheet 6 JEJE- u- Jan. z5, 1944. w H'RICHARDS 2,339,819

CAMERA Filed Nov. 22, 1939 8 Sheets-Sheet 7 Jan. 25,y 1944. w. H.RlcHARns 33.95310 CAMERA l Filed Nov. 22, 1939 8 Sheets-Sheet 8 PatentedJan. 25, 1944 UNITED STATES PATENT OFFICE (Granted under the act ofVMatch 3, 1883,y as amended April 30, 1928-; 370 O. G. 757) 19 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

This device relates to camera shutters and operating mechanism therefor.

It is an object of this invention to provide a shutter-operatingmechanism which, when moved in each of two directions, will cause theshutter to pass through a completev opening and closing cycle.

It is also an object of this invention to provide a mechanism :forsimultaneously operating. separate shutters associated with the several`lenses of a multilens camera.

It is a further object of this invention to provide a shutter-operatingmechanism which. will operate smoothly and eiciently in either of twodirections on the application, in the selected direction, of apredetermined force-the operating mechanism being so constructed andarranged that the forces for operating it in each direction are equal inmagnitude.

It' isv still a. further objectof. this invention to provide a new andnovel spring motor for driving the shutter-operating mechanism; anewshutter release latch mechanism associated'r with the motor; and amechanism geared to thelmwinding mechanism for winding the spring. motorafter each exposure, so that the spring motor will exert on theshutter-operating mechanism the same driving force for each exposure.v

It is still another object of this invention to provide viscosity meansfor regulating the shutter speed, the viscosity means beingprecalibrated in a cold chamber for a complete range of shutter speedsat temperatures that will be encountered.

It is another object of this invention to adapt aV camera for night useby combining` ina single unit, a lens shutter; shutter-operatingmechanism; and a plictoelectric cell adapted, upon energization bylight-for instance, from a flare-to operate a relay for releasing ashutteroperating mechanism.

Other objects of the invention'A will `become apparent from thefollowing description:

In the drawings, Fig. 1` is an elevational view of a multilens camerapartly broken away to show the shutter-operating mechanism;

Fig. 2 is an enlarged elevational view of the shutter-operatingmechanism shown in the cutaway portion of Fig. 1;

Fig. 3l is: a; detailed planLview of. the shutter-- operating mechanismand' the shutter? andi-lens l housing; referred: to

housing taken generally along the lines 3-3 of Fig. 1;

Fig. 4 is an elevational view looking in the direction of the'arrow 4-4in Fig. 3;

Fig.` 5` isv a cross-sectional view through the shutter and lens housingtaken generally along the lines 5-5 of Fig. 3;

Fig. 6' is a detailed plan View taken along the lines 6 -6 of Fig. 5;`

Fig. 7 is a plan view of the shutter and the link-operating mechanism"therefor with the shutter in the open or exposed position;

Fig. 8 is a plan view similar to Fig. 7 showing the shutter-operatingmechanism in closed position;V`

Fig. 9 is a detailed cross-sectional View taken along the lines 9-9 ofFig. 2;

Fig.v 10 is a detailed plan view taken along the lines Illl0 of Fig. 2;

Fig. l1 isa detailed elevational view of the latch-operating mechanismtaken along the lines H-ll of Fig.` 2;

Fig. 12 is adetailed top plan view of the latchoperating mechanismshownin Fig. 11;

Fig..l'3 is aperspectivevieW--with certain parts separated-of thelinkagemechanism for operating the shutters;

Fig. 14 is`l a viewy taken along. the lines l4--l4 ofA 3;

Fig. 15 is` adetailplan- View ofl a single shutter and a spring motorfory operating the same;

Fig..16 is'an elevational Viewl looking from the left in Fig. 15;

Fig. 17 is a detailed` plan View as seen along the lines! l'l-Il of'Fig. 16;

Fig.: 118' isk a cross-sectional View taken generally aloligthe' lines.|8--l8 of Fig. 19 of a cameralens housing. and-,shutter-operatingmechanism adapted for operationupon energization of a photoelectriccell; and

Fig. 19 is al cross-sectional the lines |9449 of Fig. 18.

Referring to the drawings, and particularly to Fig.l l, C'- refer-sgenerally to a multilens camera which, in thel preferred embodiment, isa fivelensv camera'. operativelyv associated with each lens: is a boxmember containing nlm-holding and' winding mechanism. Only two such boxmembers, numberedl I and 2, are shown in Fig. 1, but' it is to beunderstood that a box member is provided for eachflens.

Referring to Figs. 1- and 5, a'- shutter and lens generally as H, issuitably camera proper. -Thef housing view taken along comprises anupper member 3 and a lower member 4, spaced apart and suitably fastenedtogether by screws, all of which have been numbered 5. As shown in Fig.3, the housing has suitable lens-receiving openings 6, 1, 8, 9, and I8.In lower member 4 the wall defining opening I Il, constitutes a bearingfor the bearing portions I2 and |2a, respectively, of sheet-like membersI3 and I4, which form the shutter for four of the live lenses.

Shutter members |3 and I4 are provided with a series of openings adaptedto be moved into and out of alignment with lens-receiving openings 6, 1,8, and 9 for simultaneous exposure of the film associated with eachlens.

As shown in Fig. 6, members 3 and I3 are partially cut away adjacentlens opening 8, showing opening |5 in member I3 and opening I6 in memberI4 adapted to be aligned with lens opening 8 for exposure purposes.Members I3 and I4 are provided with similar openings adjacent lensopenings 6, 1, and 9.

Lens opening I8 is provided with a shutter mechanism comprising twoleaf-like members |1 and I8 pivoted at 2|. Opening I9 in member I1 andopening 20 in member I8 are adapted to be brought into alignment withlens opening I8, as shown in Fig. 7, for exposure of the film associatedwith lens opening |0. Shutter members I4 and I5, as well as shuttermembers I1 and I8, are simultaneously operated by a singleshutteroperating mechanism which is adapted, upon the application of anequal force in each of two,di rections, to move the shutters through acomplete opening and closing cycle of operation.

The shutter-operating mechanism comprises generally-as shown in Fig. 2-aspring motor M, a latch mechanism including trigger member 88 (Fig. 4)for controlling the operation of the motor, and arm A for transmittingthe operating force from the motor to the crosshead member 22.

As shown in Figs. 6 and 13, upper shutter members I1 and I8 areoperatively connected to crosshead member 22 by means of links 23 and 25pivotally connected to member 22 by pin 21 and links 24 and2li-pivotally connected to links 23 and 25 by pins 28 and 29,pivotallyreceived in openings 34 and 35 of links 24 and 26.. The .links24 and 26 are pivotally connected by pins 32 and 33 to shutter blades I8and I1, respectively. Shutter blades I3 and I4 are operatively connectedto links 23 and 25 by means of links 36 and 31. Link 36 is pivotallyconnected at one end to pin 28 and at the other end to blade I4. Link 31is pivotally connected at one end'to pin 29 and to the other end toblade I3. Pins 28 and 29 are guided for reciproca-tory movement in slots38 and 3|. Links 24 and 26 are slidably received in suitable recesses inmember 34, recess 38 being shown slidably receiving link 24. Acorresponding recess 39 is provided for link 26. Recesses 38a and 39aare provided in member 34a for slidably receiving links 36 and 31. Linkmembers4 2,3 and 25, crosshead member 22, and guiding slots 38 4 armlAris mounted for pivotal movement at'y 43.1.

Pivotally connected to arm A at 45 is a member 44 guided forreciprocatory movement in guide members 46 and 41, suitably fastenedtogether and having ears 48, 49, 58, and 5| for embracing and guidingmember 44.

Member 44 is driven backwards and forwards by spring motor M whichcomprises spring 68 fastened at one end to shaft 6| and at the other endto member 62 having a hub portion 63 rotatably mounted on shaft 6| andin bearing 64. Gear 65, integral with hub 63, meshes with gear 66,integral with shaft 61, which in turn is rotated, as shown in Fig. 1, bythe handle 68, gear 69, shaft 18, and the gears 1| and 12. Shaft 18 isalso operatively geared to the film-Winding mechanism (not shown sinceit is of more or less of a conventional type, reference being made tothe patent to Briechle et al., No. 1,890,074, :for a more specicdisclosure) so that the spring motor `ing rotation of shaft 6|.

is automatically tensioned upon each Winding of the iilm.` `To hold thespring in tensioned position, there is shown in Fig. 3 a pawl 88pivotally mounted on bracket 8| by pin 82 and urged by spring 83 intoengagement with ratchet Wheel 84, integral with hub 63. Rotation ofshaft 6| is controlled by trigger member 88 (Figs. 2, 4, l1, and 12)cooperating with oppositely projecting sear members 85 and 86, which inturn are integral with shaft 6| and offset with respect to each other.Trigger member 88 is pivotally mounted for lateral movement in support81 and is actuated by handle 98 (Fig. l) rod 9|-pivotally connected atopposite ends to handle 98and rod 92, which in turn is fixed to shaft 93(Figs. l and 11). Shaft 93 has a projecting portion 94 operativelyreceived in a slotted portion 95 of trigger member A88, so that raisingor lowering of the handle 98 results in rotation of shaft 93 and lateralmovement of trigger member 88. With the parts in position as shown inFig. 11, sear member 86 abuts against trigger member 88, prevent-Trigger member 88 is movable laterally out of engagement with sear 85and into the path of movement of sear 85. Shaft 6| is rotated through180, under action of spring 168, until sear 85 abuts trigger 88.Movement of the trigger in the opposite direction will uncover .sear 85,permitting rotation of shaft 6I untilsear 86 abuts trigger 88.` A jIntegrally united with shaft 6|-as shown in Figs. 23 and 14is adisk-like member |88 having eccentrically and freely rotatably mountedthereon, by means of pin 59, a shoe member |8| having a recess |82therein, into which a guide or projection |83 on member 44 ts. Rotationof shaft 6| rotates eccentrically mounted shoe |8| to reciprocate'member44. Sliding movement between shoe |8| and the guide |83 is of coursenecessary to convert rotary motion of shaft 6| into sliding motion ofmember 44.

Mechanism is provided-as shown in Figs. 2, 3, and 14for controlling theshutter speed in a range of temperatures that will be encountered inaerial photography. Accordingly, there is provided an adjustableviscosity resistance valve ||4, opposed Sylphons ||8 andI-interconnected only through said valve by tubes |I2 and IIS, and alever |28 between said opposed Sylphons and xed to shaft I6. Since arm Ais also xed to shaft IIS- rotatably mounted in bearing |29 ..-lever' |28and arm A move simultaneously, forcing the viscous iluid from oneSylphon into another through said valve. The valve is adjustable andprecalibrated for various shutter speeds atdifferent temperatures. n

Referring to Fig. 9, valve stem I I is adjustable to regulate theresistance to 110W of viscous fluid through the valve I I4. Indiciameans is provided to enable the operator to set the valve for desiredshutter speeds at different temperatures. Head |21 has a pin and slotsliding connection ||1.with valve stem I I5. Spring I|8 normally keepshead |21 in an up position. Valve stem I I5 is rotated with head |21 inthe up position to set the valve at a desired shutter speed indicated bypointer |26 and scale IIS. Scale I|9 is frictionally rotatably heldinadjusted position by flange on scale |2I. By pressing down on head|21, the serrations |22 thereon engage with serrations |23 on scale IIS,enabling rotation of scale IIB until the valve is adjusted with pointer|24 in a desired relation with temperature scale |25,

Referring to the modification of the invention shown in Figs. l5, 16,and l1, there is illustrated an operating mechanism for a camera havinga l single shutter. A spring motor M1, comprising a spring for operatingthe shutter-operating link mechanism, is tensioned by rotation of shaftI3 I, driven by a source of power (not shown). Integral with shaft |3|is a gear |32 which meshes with gear 33 integral with shaft |34. Shaft|3| is also provided with a. ratchet wheel |35, with whichspring-pressed pawl |35 cooperates for preventing rotation of shaft |3|in a direction which would result in unwinding of spring |30. Spring |30is fastened at one end to shaft |34 and at the other end to bracket |31,freely rotatably mounted on shaft |34. Bracket |31 has attached theretoa double sear member |38 having oppositely projecting offset sears |39and |40, which alternately abut trigger member I4 I. Rigidly attached totrigger member I4| is a trigger-operating shaft |42, guided for slidingmovement in bearings |43 and |44 of frame member |45. As shown in Fig.

16, trigger member |4| is shown in engagement l with sear member |40.Upon raising rod |42 the trigger is moved out of the path of anddisengaged from sear |40, into the path of movement of sear |39,permitting rotation of sear member |38 through 180. Rigidly attached tothe sear member to rotate therewith is a collar member |50, freelyrotatably mounted on shaft |34. Integral with collar member is a diskmember |5| having eccentrically attached thereto a cylindricalprojecting pin |52, adapted to be received in a grooved portion |53 of acrosshead member |54. As shown in Fig. 17, Crosshead member |54 isslidably received for reciprocatory movement in a guide groove |55 inmember |50. Crosshead member |54 has pivotally attached thereto by meansof pin |19 a pair of diverging link members |51 and |53. The outer endsof links |51 and |58 have pivotally attached thereto link members |50and |00, which in turn are guided for sliding movement in recesses IBIand |62 in member |56. Member |56 is provided with lateral slots |03 and|04 for guiding the pins |65 and |50, which in turn serve to pivotallyconnect link |51 to link |50, and link |58 to link |60. The outer endsof links |50 and |60 are pivotally connected to shutter members |61 and|58 at |69 and |10.

The operation of this modication of the device is as follows: Assumingspring motor Ml to be in a wound condition, trigger member |4| israised, permitting member |38, disk |5I, and cylindrical projectingmember |52 to rotate through Member |52, by engagement with slot |53 ofmember |54, moves member |54 from the position; shownainFigi 17 to-acorresponding position and |04. Continued movement of member |54 to itsother extreme position draws the shutter members together in closedposition. Upon again operating the trigger member, the Crosshead memberis moved from the left to the right in an opening and closing movementof the shutter members.

The compact, efficient shutter-operating mechanism enables to be builtinto the camera, mechanism adapted to automatically operate theshutter-operating mechanism upon energization by an external source oflight-for instance, a flare.

Referring to Figs. 18 and 19, a pair of shutter members 200 and 20| areactuated by crosshead member 203, which in turn is actuated by springs204 and 205. Pivotally connected to Crosshead member by a pin 205, are apair of link members 201 and 203. A portion of pin 205 projects intoslot 200 in guide member 2|0. Shutter members 200 and 20| are pivotallyconnected to links 201 and 208 by link members 2|| and 212, which inturn are guided in recesses 2|3 and 2|4 in member 210, as in themodification in Fig. l1. The pins connecting link 208 with link 2|2, andlink 201 with link 2| I are received in slots for guiding movement, asin Fig. 17. Operatively associated with pin 205 is a pivotally-mountedlatch 2|5, adapted to be actuated by solenoid 2I0, which in turn isenergized by a relay 2I1, operatively connected to light-sensitivephoto-electric cells 2|9 and 220. Camera housing 22| extends downwardlyto provide a casing for the assembly. Photoelectric cells 2 I9 and 220are provided with covers 222 and 223, which may be removed when it isdesired to operate the device. It will be necessary to re-cock theshutter-operating mechanism by hand-operated means (not shown) totension springs 204 and 205 and bring pin 205 into latching engagementwith latch 2I5. Naturally, the latch-operating mechanism will have to berecocked when it is dark, or the lens will have to be covered during there-cocking operation, in order to avoid unwanted lm exposure.

It is understood that the above disclosure is by way of example only,and it is intended that the scope of the invention be limited only bythe ap- .f pended claims.

I claim:

i. In a camera, shutter members and shutteroperating mechanism therefor,comprising a rotary driving element, a reciprocatory driven element,means operatively connecting said elements, releasable means forpreventing rotation of said rotary element, means operatively associatedwith said driving element for controlling the speed of operationthereof, and means connecting said recprocatory element with saidshutter members for operating the same through a complete opening andclosing cycle of operation upon movement of said reciprocatory member ineach direction including a pair of links, each link of said pair beingpivotally attached at one end to said reciprocatory element, means forguiding the other end of each link in a path normal to the path ofmovement of said reciprocatory member, and means for connecting one ofsaid members'to the saidv other end of one of said links and the otherof said members to the said other end of the other of said links.

2. In a camera, shutter members and shutteroperating mechanism therefor,comprising a rotary driving element, a reciprocatory driven element,means operatively connecting said elements, releasable means forpreventing rotation of said rotary element, means operatively associatedwith said driving element for controlling the speed of operationthereof, and linkages connecting said reciprocatory element with saidshutter members for operating the same through a complete opening andclosing cycle of operation upon movement of said reciprocatory member ineach direction-each of said linkages comprising a pair of link memberspivotally connected at their inner ends, the outer end of one of saidlink members being pivotally connected to said reciprocatory element,the outer end of the other of said link members being pivotallyconnected to one of said shutter members, and means for guiding theinner ends of said link members in a path of movement at right angles tothe path of movement of the reciprocatcry driving element.

3. In combination, pivotally-mounted shutter members; a cross-headmember mounted for reciprocatory sliding movement; link members, each ofwhich is pivotally connected at one end to said crosshead member; meansfor guiding the other end of each of said link members for movement in apath normal to and at the midpoint of the path of reciprocatory slidingmotion of the said pivotal connection on said crosshead member; andmeans pivotally connecting the guided end of each of said first-namedlinks with a shutter member whereby said shutter members execute a,complete opening and closing cycle upon movement of said crossheadmember in each direction.

4. In a multi-lens camera, a two-bladed shutter having shutter openingsoperatively associated with the several lenses of said camera and meansfor operating said shutter through a complete opening and closingoperation, comprising a reciprocal member; a pair of links, each ofwhich is pivotally connected at one end to said reciprocal member; guidemeans at the mid-point of movement of said reciprocal member and normalthereto for guiding the other ends of said links, said links divergingfrom the direction of movement of said reciprocal member at angles whichare equal in either extreme position of said reciprocal member; and linkmeans freely pivotally connecting each of said other ends of said linkswith one of the blades of said shutter.

5. Mechanism for producing relative reciprocal movement between membersconstituting a shutter, comprising a reciprocal driving element, a linkpivotally connected at one end to said driving member, means for guidingthe other end of said link normal to the direction of movement of saiddriving element, and a second link freely pivotally connecting one ofsaid shutter members to said other end of said iirst link.

6. A device as recited in claim 5, in which the inward end of saidguiding means is spaced from said driving element whereby said linkdiverges from the path of movement of said driving element.

'7. Mechanism for operating pivotally-mounted blades constituting ashutter, comprising a base member, a crosshead member guided forvreciprocal movement on said base member, and a pair of linkages, eachof which is pivotally connected at one end to said crosshead member andeccentrically freely pivotally connected at the other end to one of saidshutter blades, said base member having a pair of slots normal to and atthe mid-point of the motion of said crosshead for slidably receivingsaid other ends of said pair of linkages, the inward ends of said slotsbeing so located that the links are in an outwardly divergent positionwhen the crosshead is in either of its extreme positions.

8. In combination, a reciprocatory driven member and means forcontrolling the operative speed of said member comprising opposedSylphons, means connected to said reciprocatory member and positionedbetween said Sylphons for alternately compressing the same, anadjustable viscosity resistance valve, means connecting said Sylphonsthrough said valve for the flow of viscous fluid from one Sylphonthrough said Valve to the other Sylphon upon compression of a Sylphon bysaid connecting means.

9. A device as recited in claim 8, in which said valve is precalibratedfor diilerent shutter speeds at different temperatures and indicia meansassociated with said Valve whereby said selected speeds may be obtainedat given temperature.

l0. In a camera, shutter members; shutteroperating mechanism comprisinga rotary driving element; a reciprocatory driven element; meansoperatively connecting said elements; releasable means for limitingrotative movement of said rotary element; means operatively associatedwith said driving element for controlling the speed of operationthereof, comprising opposed Sylphons, means operatively connected tosaid driven element and positioned between said Sylphons for alternatelycompressing the same, an adjustable viscosity resistance valve, meansconnecting said Sylphons through said valve for the flow of viscous uidfrom one Sylphon through said Valve to the other Sylphon; and meansconnecting said reciprocatory element with said shutter members foroperating the same through a complete opening and closing cycle ofoperation upon movement of said reciprocatory member in each direction.

ll. In a multilens camera having a single centrally disposed lens and aplurality of lenses radially disposed with respect to said single lens,a pair of members mounted to pivot about the axis of said centrallydisposed lens and having a series of radially disposed openingscorresponding to said radially disposed lenses to constitute a multilensshutter means therefor, a pair of members mounted to pivot about an axisoffset with respect to said centrally disposed lens to constitute ashutter means therefor, and means operatively connected to both of saidshutter means for simultaneously operating the same.

12. A device as recited in claim 11, in which said operating meanscomprises a driving element reciprocal on a line passing through saidtwo axes of pivoting, a pair of divergingly arranged links pivotallyconnected at one end to said driving element, means for guiding theother ends of said links normal to said line, and means connecting onemember of each pair of members to said other end of one of said linksand the other member of each pair to said other end of the other of saidlinks.

13. In a multilens camera, a pair of pivotally mounted plate-likemembers constituting a multilens shutter-said plate-like members eachhaving a series of openings disposed to correspond with said lenses, andmeans for moving said members to bring said openings into and out ofalignment with their corresponding lenses, including a crosshead membermounted to reciprocate radially with respect to the point of pivoting ofsaid members, a pair of divergingly arranged links pivotally connectedat one end to said crosshead member, means for guiding the other end ofsaid links normal to the path of movement of said crosshead member, andmeans for connecting each one of said members to the said other end ofone of said links.

14. A device as recited in claim 13, in which said last-named meanscomprises a link pivotally connected at one end to one of said members,and at the other end to the said other end of one of said links.

15. In a camera, shutter mechanism, means for operating said shuttermechanism and means for selectively controlling the operative speed ofsaid shutter means, including opposed Sylphons, an adjustable viscosityvalve, means operatively connecting said viscosity valve and saidSylphons, and means operatively associated with said shutter-operatingmeans and said Sylphons for driving the viscous iluid from one Sylphonthrough said valve into said other Sylphon.

16. In a camera having a lens, a pair of members mounted to pivot abouta given axis and constituting shutter means for said lens, reciprocatorymeans for moving said members through a complete opening and closingcycle of operation upon movement of said reciprocatory member in eachdirection, including a pair of links, each link of said pair beingpivotally attached at one end to said reciprocatory member, means forguiding the other end of each Ilink in a path normal to the path ofmovement of said reciprocatory member, and means for connecting one ofsaid members to the said other end of one of said links and the other ofsaid members to the said other end of the other of said links.

17. In a camera, shutter members and shutteroperating mechanism thereforcomprising a rotary driving element, a reciprocatory driven element,means operatively connecting said elements, and means for releasing saidrotary element for movement and for stopping such movement includingcircumferentially spaced, radially projecting, laterally offset searmembers on said rotary element and a laterally movable trigger membersuccessively engageable with said sear members, whereby engagement ofsaid trigger member with one of said sear members functions to preventrotative movement of said driving element, and said trigger member, whenmoved laterally, becomes disengaged from said one of said sear membersand is moved into position to be engaged by and serve as a stop foranother of said sear members.

18. In a camera, shutter mechanism, motor means for operating saidshutter mechanism and means for starting and stopping said motor meansincluding a member operatively associated with said motor means andhaving thereon longitudinally spaced, laterally oiset, stop members, anda member laterally movable for successive engagement with said stopmembers whereby engagement of said member with one of said stop membersserves to stop said motor means and movement of said member laterallyserves to release said motor for operating said shutter means until saidmember becomes engaged with another of said stop members.

19. In a camera, shutter means reciprocal means operatively connected tosaid shutter means for moving the same through a complete opening andclosing cycle upon movement in each of two directions, rotary meanseccentrically connected to said reciprocal means for driving the same,said rotary means being provided with circumferentially spaced,laterally offset Sear members to rotate therewith, a trigger memberadapted to successively engage said sear members and laterally movablefrom engagement with one of said sear members into the path of movementof the other of said sear members whereby said driving member is movingthrough a complete opening and closing cycle of operation of saidshutter means whereupon another of said sear members contacts saidtrigger member.

WILLIAM H. RICHARDS.

